Same for me : the video takes a while to download, and actually runs only after refreshing the page. Apart from this, all the vids are available (and great !).

It's curious that you have problem!
I have a very old computer now, and a speedy net connection and absolutly no problem for see these tuts!
Seems the problem is just the codec and maybe your slow connection
I will say that to Steph for maybe change the format but this last one has a very good % of compress / quality of image